What do you mean about log into "community"?
Are you on the options page under CHARTS tab?
You need your same logon and password as the website.
After you set this it does NOT log you onto the website but it does enable the interaction with the account tabs such as MARKET, SIGNALS, etc... But there is no logon as in a logon you did to make this message on Forums on the OPTIONS tab.
Under the HELP menu you can go to the FORUMS, Website, etc... but this is different and does not enable the MARKET or signals tab on your MT5 running.